SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '54b6430959e41fd213574f0fc29cf440893ad9d09c4cba3b68b6f4ac2a635c9f' 
  AND token = 'wqPzsB4HzFoP35typBHAOlLqG+wJIpn3qDs2bHUF05o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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