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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c31dc1fcd88bc559f53cbab25bced2975a31025daeefc8913fe73bd4f733b18' 
  AND token = '8O1V1hWa0h57RegDlg7IwMXE655pByrKLP05xHFaN9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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