SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1b7047a89f4d1360d385a42ca1b275bb14a427650e9da6d9a2c3b6b783efd46' 
  AND token = 'SSyauxujJFYpHOhFcRiIQToAbZ086I3vC5sI+cfjGFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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