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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3dd296838c2d50099487be04d81f608ddf636df83f57ab68787b0ccc522e500e' 
  AND token = 'wUYU9CJx7jqybgHwUaLeaWk503ZbmtSlxRCXJy4MBOk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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