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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06f04e8c7feee0cde7efb99a72a661830a8d8a5add3ce89ea833935b9ab9d2ee' 
  AND token = 'XbNK8VYiISvdYW3/Ey1QKdva0qPSmFSeAOvUBKUT9Tk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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