Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '672a72c5fff7df92a138fdd0fd647e278c4073a3191c5763b8b0e8eb87efcffa' 
  AND token = 'YfKExGd0IKyxoYTrF8gBNA5fdhcCxNMQhzpCh/fatao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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