SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a189ecc3588a1df9a42c946788b8437b9f0964f4ca5178d767ec289277d48595' 
  AND token = 'nKYCdcgdYjhsM/9vAlT6w3Zg7pD1OPxR1UzNudUnICw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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