SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd9b9840645422cabf0461b9a362aa7d4d00f81f245f872f5c10b8496f1390d35' 
  AND token = 'NHXBg5/JhaKCwdmOEPV1iaAxJm/2XpvaKLG+PQE2CxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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