Use WP_Query for custom post type but result get empty

Question

You can write like

$args = array(
    'posts_per_page'   => 10, // -1 to fetch all posts
    'orderby'          => 'date',
    'order'            => 'DESC',
    'post_type'        => 'at-subscription', // the post type 
    'post_status'      => 'publish',
    'suppress_filters' => true 
);
$posts_array = get_posts( $args ); 

// For displaying all posts related to at-subscription
print_r( $posts_array );

Hope this will help you.
Thanks