SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a37e73f8a1464e03653714c6f01882c9b3024502d8ee66ad90d7e2325fdc2988' 
  AND token = '2PYliKdz2VnXZiQks+ljMqYwdGaFH6iOa7LGArGHxPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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