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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3cf94be9c1ac836132e991aeb7bd4f7edc08d802a350657ad2c18c281c50ae8f' 
  AND token = 'J59VtVmnI2OGe4MnuAP20tFVUwm0CHUsl4UMM9ujkhc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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