SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '039c69c207880914fbd8cb411642947578a696cdf137a509430af6da6e374997' 
  AND token = 'wOZRTz/o6qlICM+3MzFstfC6ZkVvqJ/id8C0cZ4QF00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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