SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2387040e851659f978c44725078e6b35d4caeed9908b9a45e59175c397cf2560' 
  AND token = 'x31hRfLqQ5GD6vkpCubFXzzt/Rqtdmc3nJcjhyhknYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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