SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '979ce1ac453b13683bbf66e8591d67abfea3dc354e68423fa664800d3922275f' 
  AND token = 'wKStQ1znWhKIYbZ06+/UuW7GAka8BjwZY/D1YCKHdFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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