SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02e16815a5ad84dca24583a9bf34afa6c4cf94d4c302f353cc304c7d3bfa1452' 
  AND token = 'b59ir/GFucFT9PWDvpVuHmFRZpwW4+Dqp9o6CbEKUzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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