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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f4c9bb8d282416ece47e886424762bbabc6d4b0086f92be1ae3626ffd7ad180f' 
  AND token = 'ojFn7TZ6Yh/9G8cmRrwiFG7QRdCCnt7J5U/hi/jrFGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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