SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec3de8a372a901e375b7e3072eb4de9f688c13f23dd665e2cb683a06465dc234' 
  AND token = 'YgFRxvtxuvlDMTfMjZBCHvCpFiKUqRwovYkIhr9w+34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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