SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5b8628171f2491e005932bb6e135bf06573eb8d1326a9cb5369279ac20dedbb1' 
  AND token = '3MjfCPhhI++BLX++24n0agvLbsOhrPRKSJPnbYOexmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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