SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd7b9648da03c6fcf60c72285b3719fbbb5c0bf6293b75e481769cad7c67a3fdc' 
  AND token = '7F4xn+zlV4vphzojurZIaWZvJJx5gHUh6ECBINeCWMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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