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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '632cdc9a6b4ccf69d510f0462e1602567e49710ac9be89e0826130a531723920' 
  AND token = '+CrbtVlAjfZiZKjI0hchImp2IFElmCCR/S5PVLATdxs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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