SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0cb677c411d950b995ca58cc610f0599640f186846d311b624b9a23c1097bcbe' 
  AND token = 'PAV/x9x+segNHB/l8KCf8mh/gS0W9Z6qQMQwtENuL9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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