SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd55a16e21703714f993307885bd9d85bcbebd9912343a058870d5df11989101' 
  AND token = 'kho8NuGC0HJs1VRlD8YqtIQhYAJ3Kvjxe8Vj5lsz4Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}