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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '19105ebe13e5cce3f725737b4b623493a5e1d446c39cb41a44d0a4397e1f79a8' 
  AND token = '47K9H1nBX/0CWsuNhWZv34yoGyEFjk7Up6ap/v42WvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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