SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b4b03af5676ef850e620f93046c97a08ffe49d721a298582d782fb5a27df2a50' 
  AND token = 'j3XKbsuV8VxCBirMu9TRS/ZSQLLe6pWeNH8pjOGJA64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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