SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a370268b331a692cc0aa51143492d91ce579b340c6e2c38a3837a959694f8b14' 
  AND token = 'EZZ0hlQBI0DrK5J6xpRAtoVzqi5+vYCMZDdCO0vXCzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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