SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '99e0f3313620723b76ecfa96d5acaba326b7ce066fa2093649ea518d097307e5' 
  AND token = 'SmzBS/VY2Kv4tyD/04QQzdt41yBGMX0KHX+5gjv8vjk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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