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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fc39ab8ceb2fd0c9f7010653c19dd75b9ba94c37855139043880930035b318f' 
  AND token = '045GZHtTD6Idu1JD9MQCUZrRPiSP/ROtUqHsTtt6nJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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