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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '271b879a6143ab7a56e0863fe10e212fa54c26a2728003434f7be6b1527d1f15' 
  AND token = 'lJy2wUkSJRFsbTxTst5mw8p47Yz2nTkGotsgch1TRhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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