SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed479b31aa5f099304db21afe3b3748a730e663557ff5b9131585f8426539a35' 
  AND token = 'wnk4sC2KzeXvsSpOXmlq5gkRvW1Qwro4L/a++0ZBQYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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