SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4a45f79659f0771480243a35ea354e7dfd2b48295f99551d0221662cc7831ab5' 
  AND token = '2ZiUbqgVWWa6UOJ4ZCW3FTNsy4LAAFjkvlHoCC5CSAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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