SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82e409cdd55082b8f236b167e2704ad03a4086edc8a665c3aa99d4b9f4ff6169' 
  AND token = 'WsZttUfpBELqpPVZqSopVi07SKK06QNr3BdF1JRhqsQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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