SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd232bd5380e550d616763a57607991bb5c6f6de2e1478e04d098d7378d7b315f' 
  AND token = 'zuLg+F1xM0eIs42/hPlhIfqGqbIONbQPnWoCcX75Lqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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