SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f9162012daff9ce316d350de66270e328fd4eacddf92c7a5b66c2aa17a64585d' 
  AND token = 'xWGwa5aLUCHFZFxmaHtKBbq2HK+9EESC/B1mtjq/Gxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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