SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e63fdfe336818e83a5a34c86097824ba83f65cd1e99ef7a3c1fb0c4dbd8f1eb3' 
  AND token = '0hr6slM6iZ0LB4NjqkDK23P/tCucvLvL45gdouK1YIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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