SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e08aaf6102847863a7d47c9b82c55279d7ddb20fc737bb5429aa430d2520701' 
  AND token = 'B+AjPPQVQXBBladvghsfCEg5HZa8dlVy57p6u/8S3Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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