SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd344271625f51d06e2078b1f17456d9f3e841b606e94bc86302264e9e5bcd2dd' 
  AND token = 'fYfsEyU+qhmQgn7Nsl5msvBN07QAGUL9cJf3uedssMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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