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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd8a7846e16535511e7800f4130ec869ce8b39c53336168481b4bbadf99f6354d' 
  AND token = 'C9o4sSDny0snk5s3U8L2YhbXZYSZSIFLqTxBbOqbYbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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