Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c5a6e6cffeab9cbc01caa6e2b3401be6bf68604b7db10749d8d38e653100f02' 
  AND token = 'oNDagUKDsfoYi5Bj+YSz4UUBxqnRKJx1AOvQs4qB8eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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