SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f0fec2861280b57fedaed1b4b9f4033c96d716c58527df9dc52a6cc85956e345' 
  AND token = 'YzH4fMSJMM1yuAjGNmCKC/QT7mePRYPnhhox0tyEzwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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