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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '050f1cb223b8e94f3f789a23ce2cbd14637abf226f72199bd1eb15382eeaf573' 
  AND token = 'cS6m9YpD+YesWM76ENnxRVT0NYPPQp/dgzVWwf9o2Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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