Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bdd3c8a4fd3cb74c7be707a0e9ac6c05e3e09eb4f34de5fee405e416d0490c6f' 
  AND token = 'QaYIMVA2tptN5QOIWso8tpb2rLyTDT5VqRkDwwsEpb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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