SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '22888a57bcc083b24c64f6f0154af0750bc42a2a7febb30be36cd9116673920d' 
  AND token = 'tZBkC5vHHbdGgzhT0tF3Ky2QIpALisu43FjE0rd6/lA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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