SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '05b59e1757cce75f4ac2cf0ec63dda6d81a698ef082894dfc1cedceb0409d642' 
  AND token = 'DIRhIF1FD7dVSVjAdv/1GbJ/KiZZi74Xg+qZY/kzfUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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