SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d24e7632c51d59eba78161ae207e689aec452147529d814192e153dde7402fd' 
  AND token = 'q/uusY2WO54cr/p1yObmbKk/LxgODTBCPvbz4H+Sh9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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