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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b447a937e7720f7aee73c3cb6587ee22dd18a71c525c7328038a67c3981fe40' 
  AND token = 'si/Rj2NBEI0/gjL6V34eievZDbQk39UiZD0+xjb2joU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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