Get Posts in a Custom Post Type category

I have trouble in getting post in a custom post type category. I have code below but it doesnt work well. It still get posts in another category.

<?php
    $query= null;
    $paged = (get_query_var('paged')) ? get_query_var('paged') : 1;
    $args=array(
        'post_type' => get_post_type(),
        'post_status' => 'publish',
        'paged' => $paged,
        'post_type_cat' => 'featured', // get_post_type() will return post_type, I add _cat -> post_type_cat
        //'orderby' => 'rand',
        'posts_per_page' => 1,
        'meta_query' => array(
            array(
                'key' => '_expiration_date',
                'value' => array(0, current_time('timestamp')),
                'compare' => 'BETWEEN'
                )),
            );
    $query = new WP_Query($args);
?>
<?php if ( $query->have_posts() ) : $query->the_post(); ?>
<?php get_template_part( 'template/featured' ); ?>
<?php else : ?>
<?php get_template_part( 'template/nofeatured' ); ?>
<?php endif; ?>
<?php wp_reset_query(); ?>

Can you help me?

Thank you

As far as I know there is no such parameter as post_type_cat, you want to use either cat or if querying posts in a custom taxonomy you would use a taxonomy query.

Category query example;

$query = new WP_Query( 'cat=2,6,17,38' );

or

$query = new WP_Query( 'category_name=staff' );

See the following Codex entry for even more ways to query by category;

http://codex.wordpress.org/Class_Reference/WP_Query#Category_Parameters

Taxonomy query example;

$args = array(
    'post_type' => 'post',
    'tax_query' => array(
        array(
            'taxonomy' => 'people',
            'field' => 'slug', //can be set to ID
            'terms' => 'bob' //if field is ID you can reference by cat/term number
        )
    )
);
$query = new WP_Query( $args );

See this entry for more details:

http://codex.wordpress.org/Class_Reference/WP_Query#Taxonomy_Parameters