Query custom meta value – post view and date meta

@Sadia
Please, try this once::

$args = array(
    'post_type' => 'post',
    'posts_per_page' => '3',
    'post_status'  =>  'publish',
    'meta_key' => 'post_view',// say 200
    'orderby' => 'meta_value_num',
    'order' => 'DSC',
    'meta_query' => array(
        'relation'  =>   'AND',
            array(
                'key' => 'post_view_last',//2017-04-14
                'value' => date('Y-m-d', strtotime('-7 days')), //value of "order-date" custom field
                'compare' => '>=', //show post less than or equal to today
            )
        )
);