SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ea2a64fa0dd545a3c847ebc1fa642b037bb4ac30330f12dad8528147bb39958' 
  AND token = 'VC8yFN4WPiwQyiadfXTd5ylqnTxmA2xhsxZjTpVK+vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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