SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66363143126ee1809ba09331f1c45ccc1797380cb86dcd6f2b91643c9c17581f' 
  AND token = 'FwdCxXN0TUuWPGJQFgkdxI9ByjfrP/zuF/WGr5MxlZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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