Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5c9b748a291cc1e3880ef23843da929c82e4bb01463b17c5189ebfe9947ce5c3' 
  AND token = 'NTOKRoxDMXbNqrDZDbStEpYI9TNqCdrnHKQDaHygDsY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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