SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '591a6c86d79fdd5baf1417775e81094b8e39c1d17afe93b3132057ac3208e061' 
  AND token = '+/JwGO+7QVHPPMuW2BcqKbYYl791MX/SqnWm8LfanQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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