Delete user meta based on key value that is an array

I have a user meta key prize which is an array contains prize type and prize date. The date in unix timestamp. How I can delete the user meta by specify the prize date only?

Example code:

delete_user_meta( $userID, 'prize', $meta_value ); 
$meta_value = array(
    'prize' => array(
         // Add something here like prize date = 1506556467
    ) , 
);

Key value in the database look like this:

a:2:{i:0;s:17:"prize name";i:1;i:1506556467;}

And what if I want to delete the metakeys if the value in between 2 integer like 1506550000 and 1506550001 for example.